155 or over should do but most of it depends actually on ur weight when u go shopping for Snowboarding, ull find that most snowboards have a weight guideline for each board on the back to let u kno what size u should buy
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well it depends im also 5'6" but most sites will tell you about a 148 to 150 but i ride terrain and freeride so my board is a little longer in size i ride a 155 so i would say a 153 for terrain and 156 for freeride.